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Title: Cs[Tf 2 N]: a second polymorph with a layered structure

Journal Article · · Acta Crystallographica. Section E, Crystallographic Communications
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Here, the structural determination of the ionic liquid, caesium bis­[(tri­fluoro­meth­yl)sulfon­yl]imide or poly[[μ4-bis­[(tri­fluoro­meth­yl)sulfon­yl]imido]caesium(I)], Cs[N(SO2CF3)2] or Cs[Tf2N], reveals a second polymorph that also crystallizes in a layer structure possessing monoclinic P21/c symmetry at 120 K instead of C2/c for the known polymorph. The caesium ions in the cationic layers are coordinated by the sulfonyl groups of the bis­triflimide mol­ecules from anion layers while the tri­fluoro­methyl groups are oriented in the opposite direction, forming a non-polar surface separating the layers.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1678795
Alternate ID(s):
OSTI ID: 1435532
Report Number(s):
LA-UR-17-31306; ACSECI; PII: S2056989018004401
Journal Information:
Acta Crystallographica. Section E, Crystallographic Communications, Journal Name: Acta Crystallographica. Section E, Crystallographic Communications Vol. 74 Journal Issue: 4; ISSN 2056-9890
Publisher:
International Union of Crystallography (IUCr)Copyright Statement
Country of Publication:
United Kingdom
Language:
English

References (12)

Thermal Properties of Mixed Alkali Bis(trifluoromethylsulfonyl)amides journal February 2008
Room temperature ionic liquids based on small aliphatic ammonium cations and asymmetric amide anions journal July 2002
Room-Temperature Ionic Liquids. Solvents for Synthesis and Catalysis journal August 1999
SHELXT – Integrated space-group and crystal-structure determination journal January 2015
Structural Characterization of a Lanthanum Bistriflimide Complex, La(N(SO 2 CF 3 ) 2 ) 3 (H 2 O) 3 , and an Investigation of La, Sm, and Eu Electrochemistry in a Room-Temperature Ionic Liquid, [Me 3 N n Bu][N(SO 2 CF 3 ) 2 ] journal July 2005
Novel perfluorinated ionomers and ionenes journal June 1995
Spectroscopic and Theoretical Study of (CF 3 SO 2 ) 2 N - (TFSI - ) and (CF 3 SO 2 ) 2 NH (HTFSI) journal May 1998
Synthesis and structures of alkali metal salts of bis[(trifluoromethyl)sulfonyl]imide journal November 2002
Crystal structure refinement with SHELXL journal January 2015
Synthesis and properties of ambient temperature molten salts based on the quaternary ammonium ion journal September 1997
Water sorption by anhydrous ionic liquids journal January 2011
Thermally stable bis(trifluoromethylsulfonyl)imide salts and their mixtures journal January 2016

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Related Subjects

36 MATERIALS SCIENCE
Ionic Liquid
Bistriflimide
Layered Structure